Fire tests of steel tension rod systems with intumescent coating

2019 ◽  
Vol 11 (1) ◽  
pp. 22-32
Author(s):  
Mai Häßler ◽  
Dustin Häßler ◽  
Sascha Hothan ◽  
Simone Krüger
Keyword(s):  
Heating Rate ◽  
Fire Protection ◽  
Thermal Protection ◽  
Complex Geometry ◽  
Rapid Heating ◽  
Experimental Studies ◽  
Surface Curvature ◽  
Fire Tests ◽  
Intumescent Coating ◽  
Content Type

Purpose The purpose of this paper is to investigate the performance of intumescent coating on tension rod systems and their components. Steel tension rod systems consist of tension rods, fork end connectors and associated intersection or gusset plates. In case of fire, beside the tension rods themselves, the connection parts require appropriate fire protection. Intumescent fire protection coatings prevent a rapid heating of the steel and help secure the structural load-carrying capacity. Because the connection components of tension rod systems feature surface curvature and a complex geometry, high demand is placed on the intumescence and thermal protection performance of the coatings. Design/methodology/approach In this paper, experimental studies were carried out for steel tension rod systems with intumescent coating. The examined aspects include the foaming and cracking behaviour, the influence of different dry film thicknesses, the heating rate of the steel connecting parts in comparison to the tension rods, and the mounting orientation of the tension rods together with their fork end connectors. Findings The results show that a decrease in surface curvature and/or an increase in mass concentration of the steel components leads to a lower heating rate of the steel. Moreover, the performance of the intumescent coating on tension rod systems is influenced by the mounting orientation of the steel components. Originality/value The findings based on fire tests contribute to a better understanding of the intumescent coating performance on connection components of tension rod systems. This subject has not been extensively studied yet.

Fire resistance of the vertical glass structures with thermal protection foil

2020 ◽  
Vol 11 (3) ◽  
pp. 395-407
Author(s):  
András Jakab ◽  
Viktor Hlavicka ◽  
Ágoston Restás ◽  
Eva Lubloy
Keyword(s):  
Fire Resistance ◽  
Fire Protection ◽  
Heat Load ◽  
Thermal Protection ◽  
Construction Materials ◽  
Glass Layer ◽  
Content Type ◽  
Vertical Glass ◽  
Small Model ◽  
Designed Materials

Purpose During the building designing, it is very important to deal with the fire resistance of the structures. The designed materials for escape routes should be selected to ensure the usability of the structures until the time of escape. Planning affects the glass structures similarly, so these can also be partition walls and load bearing structures, although the latter is less applied on escape routes. The heat protection of the glasses can be improved with heat-protective foils, while fire protection is provided by gel intumescent material. Design/methodology/approach To research the topic of fire resistance, laboratory experiments were carried out on small-scaled glass elements with thermal protection foil at Budapest University of Technology and Economics at the Department of Construction Materials and Technologies. Findings Fire protection of small model specimens was tested with blowtorch fire and furnace heat load. During the experiments, six foils were tested. Single pane glass, double layered and triple glazed specimens were tested with blowtorch fire. Originality/value Fire protection of small model specimens was tested with blowtorch fire and furnace heat load. During the experiments, six foils were tested. Single pane glass, double layered and triple glazed specimens were tested with blowtorch fire. In case of heat-protected glazing, the foils on the “protected” side of the single pane glass do not have a fire protection effect based on blowtorch fire test. For double glassed specimens, the P35 foil has a perceptible effect, even for the requirements of the flame breakthrough (E, integrity), when the foil is placed on the inner side (position 3) of the second glass layer. The stratification of each triple glazed specimens was effective against blowtorch fire load (3 M, S4&P35), so (EI, integrity and isolation) it can meet the requirements of flame breakthrough and thermal insulation.

Ductile cement-based spray-applied fire-resistive materials

2016 ◽  
Vol 7 (2) ◽  
pp. 114-125 ◽  
Author(s):  
Qian Zhang ◽  
Victor C. Li
Keyword(s):  
Fire Protection ◽  
Experimental Studies ◽  
Steel Structures ◽  
Material Design ◽  
Field Application ◽  
High Rate ◽  
Cementitious Composite ◽  
Content Type ◽  
Engineered Cementitious Composite ◽  
Passive Fire Protection

Purpose Spray-applied fire-resistive materials (SFRMs) are the most commonly used passive fire protection for steel structure in the USA. However, they are often called into question because of their poor durability (cohesive and adhesive) performance. Being an inherently brittle material with low tensile strength, SFRM tends to dislodge and delaminate under extreme loads and service loads. Such loss of fire protection greatly endangers the steel structures, especially under multi-hazards like post-earthquake/impact fires. The purpose of this paper is to introduce a new technology of a ductile cement-based SFRM, namely, spray-applied fire-resistive engineered cementitious composite (SFR-ECC) that overcomes the aforementioned problems and contributes toward enhanced fire safety of steel structures. Design/methodology/approach SFR-ECC has been developed as a durable alternative to conventional SFRM by adopting engineered cementitious composite (ECC) technology in the material design process. Various experimental studies have also been conducted to fully evaluate the performance of SFR-ECC. Findings It is found that SFR-ECC possesses much better durability performance under both static and high-rate loading compared to conventional SFRMs. With many unique properties, applications of SFR-ECC for pre-fabrication of passive fire protection are also found to be feasible. Originality/value This paper is a comprehensive introduction of the newly developed SFR-ECC. It summarizes the key properties of SFR-ECC and provides a useful guideline for further investigation and field application of SFR-ECC.

Predicted temperature development on protected cellular steel beam (CSB) under fire exposure

2019 ◽  
Vol 11 (2) ◽  
pp. 205-220
Author(s):  
Fariz Aswan Ahmad Zakwan ◽  
Ruqayyah Ismail ◽  
Renga Rao Krishnamoorthy ◽  
Azmi Ibrahim
Keyword(s):  
Fire Protection ◽  
Fire Hazard ◽  
Temperature Drop ◽  
Steel Beam ◽  
Fire Exposure ◽  
Intumescent Coating ◽  
Content Type ◽  
Passive Fire Protection ◽  
Temperature Development ◽  
Beam Section

Purpose This paper aims to investigate the predicted temperature behaviour of the protected cellular steel beam (CSB) with circular web openings at elevated temperature through finite element simulation. Design/methodology/approach Temperature development along the CSB were analysed and used for parametric investigation. In addition, this research paper investigates the novelty application of various intumescent coating thicknesses covering the whole CSB to cut down the temperature development along the beam section. Findings From the simulation outcomes, it shows that intumescent coating has a significant effect in reducing the temperature development along the CSB section. Thicker intumescent coating contributes to a higher temperature drop at the bottom tee section than the upper tee section. Originality/value The use of structural CSB has gained popularity among engineers and architects. This type of beam allows serviceability ducts and pipes to pass through the main steel web section under the flooring system, thus providing larger headroom for designers. Nevertheless, in any structural steel building, it is highly risky for CSB to be exposed to fire hazard if it were triggered accidentally. To mitigate and reduce fire exposure risk which might compromise the strength and stiffness of CSB, a passive fire protection is proposed to minimise the risk. One of the common passive fire protection materials used for steel beam section is intumescent coating. Intumescent coating is by far the cheapest solution to protect CSB as compared to other passive fire protection system. Intumescent coating can absorb some portion of heat exposure which subsequently translates a lower temperature development along the CSB section.

Numerical model for the fire protection performance and the design of intumescent coatings on structural steel exposed to natural fires

2019 ◽  
Vol 11 (1) ◽  
pp. 33-50 ◽  
Author(s):  
Waldemar Weisheim ◽  
Peter Schaumann ◽  
Lisa Sander ◽  
Jochen Zehfuß
Keyword(s):  
Numerical Model ◽  
Heating Rate ◽  
Fire Protection ◽  
Material Properties ◽  
Large Scale ◽  
Material Model ◽  
Small Scale ◽  
Content Type ◽  
Natural Fires ◽  
Rate Dependent

Purpose This paper aims to deal with the experimental and numerical investigations of the fire protection performance of a waterborne intumescent coating (IC) on structural steel in case of natural fires. Based on own small-scale laboratory tests, an advanced numerical model is developed to simulate the fire protection performance of the investigated coating in case of arbitrary fire scenarios. The insulation efficiency of the coating is described within the model by temperature and heating rate-dependent material properties, such as expansion factors, thermal conductivity and heat capacity. The results of the numerical model are compared to own large-scale fire tests of an unloaded I-section beam and column. Design/methodology/approach As natural fires can show arbitrary regimes, the material properties of the waterborne IC are investigated for various heating rates. Based on these investigations, a material model for the IC is implemented in the finite element program ABAQUS. With the help of user subroutines, the material properties of the coating are introduced for both the heating and cooling phase of natural fires, allowing for two- and three-dimensional thermomechanical analyses of coated steel elements. Findings The results of the performed small-scale laboratory tests show a heating rate-dependent behavior of the investigated coating. The mass loss as well as the expansion of the coating change with the heating rate. Moreover, the material properties obtained on small scale are valid for large scale. Therefore, a material model could be developed that is suitable to reproduce the results of the large-scale fire tests. Additionally, with the help of the numerical model, a dimensioning approach for the dry film thickness (DFT) of the investigated coating is derived for arbitrary natural fires. Research limitations/implications The material properties presented in this paper are only valid for the investigated waterborne IC and the parameter area that was chosen. However, the developed modeling approach for the fire protection performance of ICs is general and can be applied for every coating that is part of the intumescent product family. Originality/value Until now, only few research works have been carried out on the fire protection performance of ICs under non-standard fire exposure. This paper deals extensively with the material properties and the material modeling of a waterborne IC exposed to natural fires. Especially, the laboratory examinations and the numerical simulations are unique and allow for new evaluation possibilities of ICs.

An investigation into waterborne intumescent coating with different fillers for steel application

2018 ◽  
Vol 47 (2) ◽  
pp. 142-153 ◽  
Author(s):  
K. Md Nasir ◽  
N.H. Ramli Sulong ◽  
M.R. Johan ◽  
A.M. Afifi
Keyword(s):  
Fire Protection ◽  
Oxygen Index ◽  
Human Life ◽  
Equilibrium Temperature ◽  
Limiting Oxygen Index ◽  
Intumescent Coating ◽  
Content Type ◽  
Char Layer ◽  
Mineral Fillers ◽  
Practical Implications

Purpose This study aims to discuss the modification and/or improvement of intumescent coating system by incorporating waterborne resin with an appropriate combination of flame-retardant additives and four different fillers, namely, TiO2, Al(OH)3, Mg(OH)2 and CaCO3. Design/methodology/approach Coating mixtures are characterized using the Bunsen burner, thermogravimetric analysis, limiting oxygen index, scanning electron microscope, static immersion bath, Fourier transform infrared and adhesion tester. Findings Results show that the combination of coating with CaCO3 filler significantly improved fire protection performance because of its thick char layer and the equilibrium temperature being 264°C. Char layer showed a uniform dense foam structure on micrograph and this formulation had adhesion strength of 2.13 MPa, which indicates effectiveness of the interface adhesion on substrate. Conversely, the combination of coating with Al(OH)3 exhibited highest oxygen index of 35 per cent, which resulted in excellent flammability resistance. Research limitations/implications This paper discusses only the effect of mineral fillers on properties of intumescent coatings. Practical implications In the modern design of building infrastructure, fire safety is significant for the protection of human life and assets. The application of intumescent coating in buildings is currently practiced because of its effect on material flammability during a fire. Originality/value The analysis method to evaluate the performance of water-borne resin with different fillers is formulated, and it could be applied in all kinds of coatings and mixtures to be used as an effective fire protection system for steel constructions.

Think about it – can portrayals of homosexuality in advertising prime consumer-perceived social connectedness and empathy?

2017 ◽  
Vol 51 (1) ◽  
pp. 82-98 ◽  
Author(s):  
Nina Åkestam ◽  
Sara Rosengren ◽  
Micael Dahlen
Keyword(s):  
Design Methodology ◽  
Social Connectedness ◽  
Experimental Studies ◽  
Social Effects ◽  
Attitudes Toward Homosexuality ◽  
Content Type ◽  
Advantages And Disadvantages ◽  
Thought Listing ◽  
Societal Level ◽  
Practical Implications

Purpose This paper aims to investigate whether portrayals of homosexuality in advertising can generate social effects in terms of consumer-perceived social connectedness and empathy. Design/methodology/approach In three experimental studies, the effects of advertising portrayals of homosexuality were compared to advertising portrayals of heterosexuality. Study 1 uses a thought-listing exercise to explore whether portrayals of homosexuality (vs heterosexuality) can evoke more other-related thoughts and whether such portrayals affect consumer-perceived social connectedness and empathy. Study 2 replicates the findings while introducing attitudes toward homosexuality as a boundary condition and measuring traditional advertising effects. Study 3 replicates the findings while controlling for gender, perceived similarity and targetedness. Findings The results show that portrayals of homosexuality in advertising can prime consumers to think about other people, thereby affecting them socially. In line with previous studies of portrayals of homosexuality in advertising, these effects are moderated by attitudes toward homosexuality. Research limitations/implications This paper adds to a growing body of literature on the potentially positive extended effects of advertising. They also challenge some of the previous findings regarding homosexuality in advertising. Practical implications The finding that portrayals of homosexuality in advertising can (at least, temporarily) affect consumers socially in terms of social connectedness and empathy should encourage marketers to explore the possibilities of creating advertising that benefits consumers and brands alike. Originality/value The paper challenges the idea that the extended effects of advertising have to be negative. By showing how portrayals of homosexuality can increase social connectedness and empathy, it adds to the discussion of the advantages and disadvantages of advertising on a societal level.

STRUCTURAL CHARACTERISTICS OF (Ba,Sr)TiO3 THIN FILMS BY RAPID THERMAL ANNEALING

2007 ◽  
Vol 14 (01) ◽  
pp. 141-145
Author(s):  
Q. Y. ZHANG ◽  
S. W. JIANG ◽  
Y. R. LI
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Heating Rate ◽  
Thermal Annealing ◽  
Rapid Thermal Annealing ◽  
Rapid Heating ◽  
Structural Characteristics ◽  
High Heating Rate ◽  
Duration Time ◽  
Temperature Heating

The rapid thermal annealing (RTA) process was adapted to crystallize the amorphous ( Ba,Sr ) TiO 3 thin films prepared on Si (111) substrates by RF magnetic sputtering deposition. The effect of annealing temperature, heating rate and duration time on crystallization was studied through X-ray diffraction and atomic force microscopy. The result shows that the crystallinity and grain size were strongly dependent on the temperature, heating rate, and duration time. Higher heating rate leads to smaller grain size. In high heating rate, the grain size shows different dependence of temperature from that of low heating rate. For a heating rate of 50°C/s, the grain size decreased with temperature increasing below 700°C, while after that temperature, the grain size increased slightly with the temperature increasing. At a certain temperature, the crystallinity and surface roughness improved with increase in annealing time, while grain size changed little. The effect of rapid heating rate on the nucleation and grain growth has been discussed, which contributes to the limited grain size of the annealed ( Ba,Sr ) TiO 3 thin films.

The interactive effect of insight and cuteness in driving purchase likelihood: a lay belief of creativity

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Felix Septianto ◽  
Rokhima Rostiani ◽  
Widya Paramita
Keyword(s):  
New Products ◽  
Interactive Effect ◽  
Experimental Studies ◽  
New Product ◽  
Underlying Mechanism ◽  
Content Type ◽  
Narrative Study ◽  
Managerial Implications ◽  
Purchase Likelihood

PurposeWhile new product introductions can potentially promote growth and benefit for brands, it remains unclear how marketers can develop effective communication strategies to increase the chance of success for new products. The present research investigates the role of cuteness in leveraging the effectiveness of a narrative emphasizing an insight versus an effort in this regard.Design/methodology/approachThis research presents two experimental studies. Study 1 examines the moderating role of cuteness on the likelihood of purchasing a new product featuring an insight-based (vs effort-based) narrative. Study 2 extends the findings of Study 1 using different stimuli and establishes the underlying mechanism.FindingsResults show that when a cuteness appeal is present, an insight-based (vs effort-based) narrative will lead to a higher purchase likelihood. However, these differences do not emerge when a cuteness appeal is absent (a control condition). Further, perceived brand creativeness will mediate this effect.Originality/valueThe findings of this research contribute to the literature on lay belief of creativity, cuteness, and product narrative, as well as managerial implications on how to promote new products.

Effect Of The Rib Inclination Angle On Liquid Film Spreading Over The Structured Surface

2015 ◽  
Vol 10 (1) ◽  
pp. 42-49
Author(s):  
Aleksandr Pavlenko ◽  
Oleg Volodin ◽  
Vladimir Serdyukov
Keyword(s):  
Liquid Film ◽  
Flow Rate ◽  
Inclination Angle ◽  
High Speed ◽  
Film Flow ◽  
Complex Geometry ◽  
Experimental Studies ◽  
Local Flow ◽  
Structured Packing ◽  
Film Spreading

Results of experimental studies on hydrodynamics of the film flow of liquid nitrogen over the surface of the single elements of structured packing are presented. The effect of inclination angle of the large ribs and perforation on the zones of liquid film spreading over the corrugated surface with microtexture at different Reynolds numbers of the film is shown based on a comparison of experimental data. It is shown that the angle of large rib inclination has a significant influence on redistribution of the local flow rate of liquid flowing on the surface with complex geometry. Analysis of results of the high-speed video revealed that in a vicinity of the vertical lateral edges of corrugated plates, the intense rivulet flows are formed, including those with separation from the film flow surface. This negative factor can lead to significant liquid accumulation and flow near the vertical edges of the structured packing and on the inner wall of the heat exchanging apparatuses and, finally, to a significant increase in the degree of maldistribution of local liquid flow rate over the crosssection, for instance, of the distillation columns.

Toward an agreement on terminology of nuclear and subnuclear divisions of the motor thalamus

1997 ◽  
Vol 86 (4) ◽  
pp. 670-685 ◽  
Author(s):  
Giorgio Macchi ◽  
Edward G. Jones
Keyword(s):  
Nonhuman Primates ◽  
Experimental Studies ◽  
Medial Lemniscus ◽  
Nuclear Mass ◽  
Content Type ◽  
Human Thalamus ◽  
Human Motor ◽  
Motor Thalamus ◽  
Fine Print ◽  
Somatosensory Areas

✓ The nomenclature most commonly applied to the motor-related nuclei of the human thalamus differs substantially from that applied to the thalamus of other primates, from which most knowledge of input—output connections is derived. Knowledge of these connections in the human is a prerequisite for stereotactic neurosurgical approaches designed to alleviate movement disorders by the placement of lesions in specific nuclei. Transfer to humans of connectional information derived from experimental studies in nonhuman primates requires agreement about the equivalence of nuclei in the different species, and dialogue between experimentalists and neurosurgeons would be facilitated by the use of a common nomenclature. In this review, the authors compare the different nomenclatures and review the cyto- and chemoarchitecture of the nuclei in the anterolateral aspect of the ventral nuclear mass in humans and monkeys, suggest which nuclei are equivalent, and propose a common terminology. On this basis, it is possible to identify the nuclei of the human motor thalamus that transfer information from the substantia nigra, globus pallidus, cerebellum, and proprioceptive components of the medial lemniscus to prefrontal, premotor, motor, and somatosensory areas of the cerebral cortex. It also becomes possible to suggest the principal functional systems involved in stereotactically guided thalamotomies and the functional basis of the symptoms observed following ischemic lesions in different parts of the human thalamus.

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